<template>
  <div>
    <!-- 面包屑导航栏区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>权限管理</el-breadcrumb-item>
        <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
        <!--添加角色按钮区域  -->
        <el-row>
          <el-col>
            <el-button type='primary'>添加角色</el-button>
          </el-col>
        </el-row>
        <!-- 角色列表区域 -->
        <el-table :data="rolelist" border stripe>
        <!-- 展开列 -->
          <el-table-column type='expand'>
            <template slot-scope="scope">
              <el-row :class="['bdbottom',i1 ===0 ? 'bdtop':'','vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
                <!-- 渲染一级权限 -->
                <el-col :span="5">
                  <el-tag closable
                          @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                  <i class="el-icon-caret-right"></i>
                </el-col>
                <!-- 渲染二级和三级权限 -->
                <el-col :span="19">
                  <!-- 通过for循环 嵌套渲染二级权限 -->
                  <el-row :class="[i2 ===0 ? '':'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                    <el-col :span="6">
                      <el-tag type="success"
                              closable
                              @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                      <i class="el-icon-caret-right"></i>
                    </el-col>
                    <!-- 渲染三级权限 -->
                    <el-col :span="18">
                      <el-tag type="warning" v-for="(item3) in item2.children"
                              :key="item3.id"
                              closable
                              @close="removeRightById(scope.row, item3.id)">
                        {{item3.authName}}
                      </el-tag>
                    </el-col>
                  </el-row>
                </el-col>
              </el-row>
              <pre>
                {{scope.row}}
              </pre>
            </template>
          </el-table-column>
          <!-- 索引列 -->
          <el-table-column type='index'></el-table-column>
          <el-table-column label='角色名称' prop='roleName'></el-table-column>
          <el-table-column label='角色描述' prop='roleDesc'></el-table-column>
          <el-table-column label='操作' width="300px">
            <template slot-scope="scope">
              <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
              <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
              <el-button size="mini" type="warning" icon="el-icon-setting"
                          @click="showSetRightDialog(scope.row)" :aa='scope.row'>分配权限</el-button>
            </template>
          </el-table-column>
        </el-table>
    </el-card>
    <!-- 分配权限 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree :data="rightlist"
              :props="treeProps"
              show-checkbox
              node-key='id'
              default-expand-all
              :default-checked-keys="defKeys"
              ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible= false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Roles',
  data() {
    return {
      // 所有角色
      rolelist: [],
      // 控制分配权限对话框的显示和隐藏
      setRightDialogVisible: false,
      // 所有权限的数据
      rightlist: [],
      // 树形控件
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点id值数组
      defKeys: [],
      // 当前即将分配权限的id
      roleId: ''
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }
      this.rolelist = res.data
      this.$message.success('获取角色列表成功')
    },
    // 根据id删除对应的权限
    async removeRightById(role, rightId) {
      // 弹框提示用户是否删除
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除')
      }
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败')
      }
      // this.getRolesList()
      role.children = res.data
    },
    async showSetRightDialog(role) {
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取所有权限数据失败')
      }
      // 获取到的权限数据，报错到data中
      this.rightlist = res.data
      // 递归获取三级节点的id
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归的形式,获取角色下所有三级权限的id，并保存到defkey数组中
    getLeafKeys(node, arr) {
      // 如果当前节点不包含children属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item =>
        this.getLeafKeys(item, arr)
      )
    },
    // 监听分配权限对话框的关闭
    setRightDialogClosed() {
      this.defKeys = []
    },
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败')
      }
      this.$message.success('分配权限成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style  scoped>
    .el-tag{
        margin: 7px;
    }
    .bdtop {
        border-top: 1px solid #eee;
    }
    .bdbottom {
        border-bottom: 1px solid #eee;
    }
    .vcenter {
      display: flex;
      align-items: center;
    }
</style>
